Mapping properties of the quark gluon plasma in Pb-Pb and Xe-Xe collisions at energies available at the CERN Large Hadron Collider

Abstract

A phenomenological analysis of the experimental measurements of transverse momentum spectra of identified charged hadrons and strange hyperons in Pb-Pb and Xe-Xe collisions at the LHC is presented. The analysis is based on the relativistic fluid dynamics description implemented in the numerically efficient \textsc{Fluid{\it u}M} approach. Building on our previous work, we separate in our treatment the chemical and kinetic freeze-out, and incorporate the partial chemical equilibrium to describe the late stages of the collision evolution. This analysis makes use of Bayesian inference to determine key parameters of the QGP evolution and its properties including the shear and bulk viscosity to entropy ratios, the initialisation time, the initial entropy density, and the freeze-out temperatures. The physics parameters and their posterior probabilities are extracted using a global search in multidimensional space with modern machine learning tools, such as ensembles of neural networks. We employ our newly developed fast framework to assess systematic uncertainties in the extracted model parameters by systematically varying key components of our analysis.

17 pages, 7 figures

References in corpus (14)

• Alternative ansatz to wounded nucleon and binary collision scaling in high-energy nuclear collisions
• Multi-system Bayesian constraints on the transport coefficients of QCD matter
• Bayesian analysis of heavy ion collisions with the heavy ion computational framework Trajectum
• Phenomenological constraints on the transport properties of QCD matter with data-driven model averaging
• Transport Coefficients of Bulk Viscous Pressure in the 14-moment approximation
• A transverse momentum differential global analysis of Heavy Ion Collisions
• Evidence of the triaxial structure of ${}^{129}$Xe at the Large Hadron Collider
• Chemical freeze-out temperature in hydrodynamical description of Au+Au collisions at sqrt(s_NN) = 200 GeV
• The Bulk Viscosity of a Pion Gas
• Bose-Einstein condensation of pions in heavy-ion collisions at the CERN Large Hadron Collider (LHC) energies
• Production of pions, kaons, (anti-)protons and $\varphi$ mesons in Xe-Xe collisions at $\sqrt{s_{\mathrm{NN}}}=5.44$ TeV
• Statistics of initial density perturbations in heavy ion collisions and their fluid dynamic response
• A fluid-dynamic approach to heavy-quark diffusion in the quark-gluon plasma
• Fluid dynamics of charm quarks in the quark--gluon plasma

Cited by in corpus (2)

• Applications of emulation and Bayesian methods in heavy-ion physics
• Quantification of the low-$p_{\mathrm{T}}$ pion excess in heavy-ion collisions at the LHC and top RHIC energy